Discovering Earth's Interior

Comments (0)

Transcript of Discovering Earth's Interior

Discovering Earth's InteriorScientists use seismic waves to learn about the Earth's InteriorSeismologists measure changes in the speed and direction of seismic waves the penetrate the interior of the planet.The Composition of the EarthScientists divide the Earth into three layers:The Structure of the EarthLithosphere-is the solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.The Dynamic EarthSeismic waves are the same waves that travel through the Earth's interior during an earthquakeEx.) When you tap a Melon to see if its ripeA seismic wave is altered by nature of the material through which it travels-They learned that the Earth is made up of different layers and have inferred what substances that make up each layer.-The Crust -The Mantle -The CoreThese layers become progressively denserThe mantle is the layer of rock between the crust and the coreThe core is the central part of the Earth below the mantle.Asthenosphere- the solid, plastic layer of the mantle below the lithosphere. -Made of mantle rock that flows slowly, allows tectonic plates to moveThe Earth's outer core is a dense liquid layer The inner and outer core make up about 1/3 the Earth's massBy Luis OngThe crust is the thin, and solid outermost layer of the Earth-The thinnest layer-Makes up less than 1 percent of the Earth's mass-5 to 8 kilometers thick beneath the oceans-20 to 70 kilometers thick beneath the continents.The Mantle is the layer of rock between the crust and core-Made up of rocks of medium density-Makes up about 64 percent of the Earth's massThe core is the central part of the Earth below the mantle.-Composed of the densest elementssolid inner core-Has a liquid outer core and a